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There is a tar file which was created few days before, this tar file was created on the /files directory.

And now /files directory has new files uploaded in it.

My question is how to create another files with only the new files uploaded.

Thanks..

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Sounds to me like you want to do a incremental backup (Also look at differential to see if that is what you want). Here is good tutorial on how to do incremental backups with tar.

If you want just a diff, than use the -d switch (at least with GNU tar):

-d, --diff, --compare
              find differences between archive and file system

So for example tar -df foo.tar *

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